The Malindian stomach worm was a parasitic animal that could cause illness in Humans. The accepted medical guidance was to allow the worm to gestate before extraction, which took 24 hours.
In 3190, Fleet Admiral Charles Vance was supposedly incapacitated by a Malindian stomach worm, necessitating that Federation President Laira Rillak assign Captains Michael Burnham and Saru to attend a Ni'Var diplomatic conference in his stead. (DIS: "All Is Possible")